I was gathering some stuff to work on the Sequoia this weekend and picked up some gear oil for the diffs and t-case. I didn't look at the manual before I went and just picked up the 75w90 that I use in the FJ. Looking at the manual now and it says the rear diff should have 140. Am I correct in thinking that there isn't too much of a difference between the two? The Sequoia isn't going to be towing anything nor will it be seeing dirt (at least for the time being). Should I head back tomorrow and exchange some of the 90 for the 140?